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Age differences in recognition memory of the rhesus monkey (Macaca mulatta)
S K Presty1, J Bachevalier, L C Walker
1Neuropathology Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD 21205-2182.
Neurobiology of Aging
|September 1, 1987
Summary
Aging impairs recognition memory in rhesus monkeys, particularly with longer delays and more objects. This decline in visual recognition mirrors age-related memory loss in humans.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Primatology
Background:
- Aging is associated with memory decline in humans and nonhuman primates.
- Recognition memory is a sensitive indicator of limbic system function.
Purpose of the Study:
- To investigate age-related impairments in recognition memory in rhesus monkeys.
- To assess if nonhuman primates exhibit deficits similar to humans in memory tasks with increased difficulty.
Main Methods:
- Rhesus monkeys across four age groups (3-6, 14-17, 20-24, 25-29 years) were trained on a delayed nonmatching-to-sample task.
- Task difficulty was increased by lengthening delay intervals and object list lengths.
- Performance was evaluated based on age and task demands.
Main Results:
- Minimal age-related differences were observed in learning the basic recognition task.
- Significant age-related impairments emerged with increased delay intervals and list lengths.
- Older monkeys showed the most pronounced deficits in recognition memory under higher cognitive load.
Conclusions:
- Recognition memory in rhesus monkeys declines with advanced age, especially under challenging conditions.
- These findings suggest that aging affects cognitive processes in nonhuman primates similarly to humans.
- The study highlights the utility of nonhuman primates for modeling age-related memory impairments.
